import 'package:flutter/material.dart';

class SizedboxTest  extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("SizedBox"),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Container(
              width: 300,
              height: 100,
              color: Colors.blue,
              child: Center(
                child: Text(
                  'visible Container',
                  style: TextStyle(
                    color: Colors.amber
                  ),
                ),
              ),
            ),
            SizedBox(height: 100)
          ],
        ),
      ),
    );
  }
}